June 2003
Intermediate to advanced
432 pages
15h 56m
English
book
Cisco Catalyst QoS: Quality of Service in Campus Networks
by Mike Flannagan - CCIE® No. 7651, Richard Froom - CCIE No. 5102, Kevin Turek - CCIE No. 7284
Content preview from Cisco Catalyst QoS: Quality of Service in Campus Networks
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Classification and Marking at Layer 3 51
Classification and Marking at Layer 3
RFC 791 first defined Layer 3 packet marking in terms of IP precedence and type of service
(ToS), whereas RFC 795 expanded on the service mappings of the TOS bits. The discussion
of these RFCs provided here is for historical purposes, and it should be noted that both of
these RFCs are obsolete, due to various RFCs that are part of the DiffServ architecture.
Refer to Chapter 1 for a discussion of current RFCs that are part of the DiffServ archi-
tecture.
IP Precedence and the Type of Service Byte
RFC 791 defines the three most significant bits of the ToS byte as the IP precedence ...
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